/*
 * Date Format 1.2.3
 * (c) 2007-2009 Steven Levithan <stevenlevithan.com>
 * MIT license
 *
 * Includes enhancements by Scott Trenda <scott.trenda.net>
 * and Kris Kowal <cixar.com/~kris.kowal/>
 *
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */

var dateFormat = function() {
    var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g, timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g, timezoneClip = /[^-+\dA-Z]/g, pad = function(
            val, len) {
        val = String(val);
        len = len || 2;
        while (val.length < len)
            val = "0" + val;
        return val;
    };

    // Regexes and supporting functions are cached through closure
    return function(date, mask, utc) {
        var dF = dateFormat;

        // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
        if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
            mask = date;
            date = undefined;
        }

        // Passing date through Date applies Date.parse, if necessary
        date = date ? new Date(date) : new Date;
        if (isNaN(date))
            throw SyntaxError("invalid date");

        mask = String(dF.masks[mask] || mask || dF.masks["default"]);

        // Allow setting the utc argument via the mask
        if (mask.slice(0, 4) == "UTC:") {
            mask = mask.slice(4);
            utc = true;
        }

        var _ = utc ? "getUTC" : "get", d = date[_ + "Date"](), D = date[_ + "Day"](), m = date[_ + "Month"](), y = date[_ + "FullYear"](), H = date[_ + "Hours"](), M = date[_ + "Minutes"](), s = date[_ + "Seconds"](), L = date[_ + "Milliseconds"](), o = utc ? 0
                : date.getTimezoneOffset(), flags = {
            d : d,
            dd : pad(d),
            ddd : dF.i18n.dayNames[D],
            dddd : dF.i18n.dayNames[D + 7],
            m : m + 1,
            mm : pad(m + 1),
            mmm : dF.i18n.monthNames[m],
            mmmm : dF.i18n.monthNames[m + 12],
            yy : String(y).slice(2),
            yyyy : y,
            h : H % 12 || 12,
            hh : pad(H % 12 || 12),
            H : H,
            HH : pad(H),
            M : M,
            MM : pad(M),
            s : s,
            ss : pad(s),
            l : pad(L, 3),
            L : pad(L > 99 ? Math.round(L / 10) : L),
            t : H < 12 ? "a" : "p",
            tt : H < 12 ? "am" : "pm",
            T : H < 12 ? "A" : "P",
            TT : H < 12 ? "AM" : "PM",
            Z : utc ? "UTC" : (String(date).match(timezone) || [ "" ]).pop().replace(timezoneClip, ""),
            o : (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
            S : [ "th", "st", "nd", "rd" ][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
        };

        return mask.replace(token, function($0) {
            return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
        });
    };
}();

// Some common format strings
dateFormat.masks = {
    "default" : "ddd mmm dd yyyy HH:MM:ss",
    shortDate : "m/d/yy",
    mediumDate : "mmm d, yyyy",
    longDate : "mmmm d, yyyy",
    fullDate : "dddd, mmmm d, yyyy",
    shortTime : "h:MM TT",
    mediumTime : "h:MM:ss TT",
    longTime : "h:MM:ss TT Z",
    isoDate : "yyyy-mm-dd",
    isoTime : "HH:MM:ss",
    isoDateTime : "yyyy-mm-dd'T'HH:MM:ss",
    isoUtcDateTime : "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
    dayNames : [ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" ],
    monthNames : [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ]
};

// For convenience...
Date.prototype.format = function(mask, utc) {
    return dateFormat(this, mask, utc);
};

exports.fn = dateFormat;
